b' APPLICATION GUIDEGeneral Works Best in Heavy-Duty PurposeGeneralHeavy-DutyPurpose Black This Material TiNBlack Oxide Oxide Bright CobaltAluminum/Aluminum Alloys; Bronze, Soft and Medium Iron, CastSteel, Low and Medium Carbon Steel, High Alloy Steel, Stainless and PHTough, Medium and High-Tensile Strength Alloys Wood and Plastic Point: 135 Split 135 Split 135 Split 135 Split 135 Split 135 Split 118 118 135 SplitPage # 9-13 14 15 16-17 18 19-20 21-22 23-25 26-27DRILL TROUBLESHOOTING GUIDETroublePossible CausesCorrectionsDrill Breaks Spring or back lash in press or workTest press and work for rigidity and alignment Too little lip reliefRegrind properly Speed to low in proportion to the feedIncrease or decrease speed Dull drillSharpen drill Possible chip congestionPeck drillOuter CornerUneven hardness in work materialReduce speed Breakdown Too much speedReduce speed Improper cutting compoundUse proper cutting compoundDrill Breaks inChipsclogupflutes Increase speed. Use drills designed for these materialsBrass or WoodCutting Lips ChippedToo much feedReduce feed Too much lip reliefRegrind properlyCracking or CheckingHeated and cooled too quicklyWarm slowly before using. Do not throw cold water on hot drill whilein Cutting Edgesgrinding or drilling Too much feedReduce feedHole too LargeUnequal angle or length of the cuttingRegrind properly edges or both Loose spindleTest spindle for rigidityOnly One Lip CuttingUnequal length or angle of cutting lips or bothRegrind drill properlyDrill Splits up CenterToo little lip reliefRegrind with proper relief Too much feedReduce feedRough HoleDull or improperly ground drillRegrind properly Lack of lubricant or wrong lubricantLubricate or change lubricant Improper set-upCheck set-up Too much feedReduce feedDRILL POINT CHARACTERISTICSType Performance Benefits* CommentsType Performance Benefits CommentsGeneral purpose Not self-centering; walking canWidely available occur on hard surfacesConventional PointAcceptable drill life May produce burs on breakhrough(118) Best suited in mild steel and aluminumSelf centeringDifficulttoregrindExcellent for portable drillingSplit PointLonger drill life(118 and 135) Good for drilling on curved surfacesImproved penetration ratesRequires less effortBreaks up chipsBest suited in alloy steels 800-942-1501 www.triumphtwistdrill.comwww.triumphtwistdrill.com800-942-15016 7'